EP1973365B1 - Method and apparatus for handling random access procedure in a wireless communications system - Google Patents

Method and apparatus for handling random access procedure in a wireless communications system Download PDF

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Publication number
EP1973365B1
EP1973365B1 EP08005480A EP08005480A EP1973365B1 EP 1973365 B1 EP1973365 B1 EP 1973365B1 EP 08005480 A EP08005480 A EP 08005480A EP 08005480 A EP08005480 A EP 08005480A EP 1973365 B1 EP1973365 B1 EP 1973365B1
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Prior art keywords
rnti
random access
message
access procedure
network
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EP08005480A
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German (de)
English (en)
French (fr)
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EP1973365A3 (en
EP1973365A2 (en
Inventor
Yu-Chih Jen
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Innovative Sonic Ltd
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Innovative Sonic Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure

Definitions

  • the present invention relates to a method and apparatus for handling random access procedure in a wireless communications system according to the pre-characterizing clauses of claims I and 3.
  • the third generation mobile telecommunications system (called 3G system) provides high frequency spectrum utilization, universal coverage, and high quality, high-speed multimedia data transmission, and also meets all kinds of QoS requirements simultaneously, providing diverse, flexible, two-way transmission services and better communication quality to reduce transmission interruption rates.
  • 3G system provides high frequency spectrum utilization, universal coverage, and high quality, high-speed multimedia data transmission, and also meets all kinds of QoS requirements simultaneously, providing diverse, flexible, two-way transmission services and better communication quality to reduce transmission interruption rates.
  • the next generation mobile telecommunications technology and related communication protocols have been developed.
  • a Random Access Channel is configured in an uplink (UL) channel between a user equipment (UE) and the network, and utilized for timing alignment, RNTI (Radio Network Temporary Identifier) assignment, and resource request.
  • DL downlink
  • NB Node B
  • signals on RACH can be used for UL timing alignment.
  • UE uses downlink Synchronization Channel or reference signals to perform synchronization on timing and frame. However, since signals may be delayed due to a distance between the transmitter and receiver, UE is not able to determine whether a message transmitted from UE is at a starting position of a receiving frame of NB.
  • NB evaluates timing offset of a UE according to RACH signals from the UE, and notifies the UE to adjusting UL timing via Downlink Shared Channel (DL-SCH), to achieve timing synchronization.
  • RACH signal is composed of preambles used for UL timing synchronization and UE identity detection, or carrying short sinalling or signature.
  • RACH signals among different UEs are transmitted to NB by contention-based or non-contention-based method. That is, UE can select a RACH transmission opportunity and randomly select a preamble to transmit signals, or transmit a signal carrying a preamble assigned by the network (in such a situation, the RACH transmission opportunity is assigned by the network or selected by the UE). If the network cannot identify the transmitted RACH signal due to collision or low power, or if contention lost occurs due to a randomly-selected preamble, the UE can retransmit the RACH signal with larger power in the next available RACH transmission opportunity, until a response from the network is received or a condition is reached, e.g., maximum transmitting or maximum power.
  • a RACH transmission opportunity is related to a time-frequency radio resource, not only related to time or frequency. Therefore, when RACH physical resource is selected, its time period and frequency band are determined. Of course, at certain time period, there may be more than one frequency sub-band for selection.
  • preamble can be random access preamble, which is randomly selected by UE, or dedicated preamble, which is assigned by network (source cell or target cell). Basically, when UE uses (randomly selected) random access preamble, there is possibility another UE use the same preamble and transmit it in the same RACH opportunity so that network doesn't know whether the signal comes from one or more than one UE.
  • Random access procedure performance mainly in terms of latency and overhead is affected by collision/contention probability, time/frequency resources, number of user equipments (load), number of preamble signature, channel quality, UE identities, and even access causes and so on.
  • initial access e.g. UE originated call, network originated call, tracking area update and initial cell access
  • initial NAS signaling for NAS procedures e.g. service request, network attach, routing/tracking area update
  • synchronization request e.g. service request, network attach, routing/tracking area update
  • handover access and scheduling request e.g. service request, network attach, routing/tracking
  • the four steps are: Random Access Preamble on RACH, Random Access Response via CCCH (Common Control Channel) on DL-SCH, RRC Connection Request via CCCH on UL-SCH, and RRC Contention Resolution via DCCH on DL-SCH.
  • CCCH Common Control Channel
  • radio link failure e.g. changing new serving cell
  • tracking area update can happen. It's possible that after an UE informs eNB (enhanced Node B) in message 3 about its already having C-RNTI (e.g. by index or provide its C-RNTI directly), the C-RNTI held by the UE may either have been released or become invalid before message 4 (e.g. message 4 is asynchronous to message 3 and three retransmissions are allowed) addressed by UE identity (e.g. can be invalid as well) is received by the UE.
  • eNB enhanced Node B
  • network may consider that the UE uses its original C-RNTI so as to relocate T-CRNTI assigned in message 2 to other random access UEs while the UE adopts the previous received T-CRNTI as its C-RNTI.
  • network shall know whether the UE has C-RNTI already. It's unnecessary to provide notification of having C-RNTI to result in unnecessary overhead.
  • the purpose of initiating RA may become not essential and critical after completion of random access procedure.
  • downlink resources are allocated by CRNC when HS-SCCH sets are configured/decided by NB.
  • CRNC no more. It's not clear how network maintains the resource allocation and configuration. In addition, it's necessary to consider how continuous packet connectivity feature is fulfilled in LTE at handover.
  • the UE should expect the random access response message for both contention-based and non-contention-based random access procedures from network if the network receives the preamble over RACH.
  • the random access response message shall be addressed to a RA-RNTI corresponding to or uniquely identifying the accessing RACH time-frequency resource where the RACH accessing pattern (time-frequency within radio frame) is indicated.
  • network shall send the random access response message within flexible window (e.g. one or more TTI).
  • the network doesn't send random access response message earlier enough so that scheduled the same RACH time-frequency resource (identifying by the same RA-RNTI expected) is reached before reception of the response message (e.g. random access response message is received later than scheduled time slot of next period of the same RACH time-frequency resource within a radio frame or expected reception time for accesses at next period of the same RACH time-frequency resource within a radio frame), the problem will happen.
  • UEs sending preambles at next period of the same RACH time-frequency resource expect the same associated RA-RNTI by wasting power in reception response message which actually is intended for UEs with access attempts at previous period of the same RACH time-frequency resource. Consequently, the power control mechanism for access attempts at next period of the same RACH time-frequency resource cannot work correctly to reflect the UL channel conditions between base station and UEs with access attempts at next period of the same RACH time-frequency resource so as to may further impact subsequent transmissions.
  • UEs with the same used random access preambles at next period of the same accessing opportunity may also consider the response message intended to the UEs with the same random access preambles sending at previous period of the same accessing opportunity is intended to them so that they will all send message 3 in UL where the network cannot really differentiate which UE accesses the RACH time-frequency resource in the previous period of the accessing pattern and which one accesses later. Therefore, it's unfair to the UE sending access attempts earlier.
  • C-RNTI is used to address message 4 for RRC connected UE
  • the UE may wait for long time (e.g. until its assigned T-CRNTI is reused by a winner UE) or even forever (e.g. no winner UE uses the T-CRNTI) since message 4 is not synchronized to message 3.
  • T-CRNTI When the C-RNTI of a UE is detected or known by network upon receive message 3, it's unnecessary to address T-CRNTI on L1/L2 control channel for winner UE since UE knows its own C-RNTI if there is one. The life span of T-CRNTI should be able to be terminated before estimated duration of reception of T-CRNTI is reached. Otherwise, the T-CRNTI may be out of stocks/in shortage or availability of T-CRNTI to a UE may be delayed.
  • network may assign dedicated preambles to some UEs going to initiate random access triggered by these causes to avoid (if there is enough RACH time/frequency resources) or reduce contention (if too many UEs asking for accesses). Since normally an UE receiving dedicated preamble is in connected state and its context is available at network entity beforehand, the network entity shall know whether the UE has C-RNTI or not beforehand. It seems that it's unnecessary to assign T-CRNTI in message 2 in this kind of scenario.
  • T-CRNTI may be considered necessarily to be issued, it's unnecessary to send whole T-CRNTI on DL-SCH which not only consumes radio resource but also limits the number of UEs which can be dealt with during random access procedure in message 2 (e.g. message size so that the number of UEs being able to receive message 2 is limited if we assume each UE requires certain amount of information length in message 2).
  • HARQ is supported for contention resolution message with allowing one retransmission.
  • acknowledgment errors can lead to confusion between network and UEs. If DTX/ACK or NACK/ACK happens, for UEs originally without C-RNTI, the network will consider the UE adopts T-CRNTI as C-RNTI while the T-CRNTI is not actually used. In contrast, if ACK/NACK happens, the network will consider the UE doesn't adopt T-CRNTI as C-RNTI while the T-CRNTI is actually occupied. The further problem may occur when two UEs consider they have same C-RNTI.
  • message 4 is supported by HARQ. Therefore, if DTX/ACK happens, the network may consider an assigned T-CRNTI is adopted as a UE's C-RNTI while it's released.
  • a UE waiting for the response message should not send NACK to network corresponding to the response message. Otherwise, if acknowledgement errors happen (e.g. ACK/NACK or NACK/ACK), following UL-SCH transmission will result in radio disturbance and may be miss detected.
  • acknowledgement errors e.g. ACK/NACK or NACK/ACK
  • the UE identity may be occupied at the UE but the network considers the UE identity is free to assign.
  • the dedicated preamble may still be used by the UE when the network assigns the same dedicated preamble to another UE.
  • NAS procedures such as tracking area update (TAU), network attach (NA), and service request (SR) can be initiated when the UE is in LTE_IDLE or LTE_DETACHED.
  • TAU tracking area update
  • NA network attach
  • SR service request
  • NAS layer it's possible for NAS layer to initiate re-authentication even though it's relatively rare for cases of TAU and SR procedures.
  • duration for completion of either TAU or SR procedure usually is quite short (note: for NA, duration of procedure might be quite long) so that it would be rare that a handover would be required within the duration.
  • handover may need to be supported before S1 context has been available at eNB and RRC security has been established, shown as figure 2 .
  • D1 3GPP TS 36.300, V1.00.2007-03, Release 8, dated 5.03.2007, discloses to address the contention resolution message to the temporary C-RNTI and that a UE should promote a temporary C-RNTI as its own C-RNTI only if the UE has not any C-RNTI.
  • the present invention aims at providing a method and apparatus of handling random access procedure in a wireless communications system for implementing timing alignment and resource request, so as to enhance system efficiency.
  • the claimed method for handling a random access procedure in a user equipment, called UE hereinafter, of a wireless communications system comprises outputting a message 3 as a scheduled transmission not comprising a specific field indicating whether the UE has a cell Radio Network Temporary Identifier, called C-RNTI hereinafter, or not during the random access procedure.
  • C-RNTI Cell Radio Network Temporary Identifier
  • Fig. 4 illustrates a schematic diagram of a wireless communications system 1200.
  • the wireless communications system 1200 is preferably an LTE system, and is briefly composed of a network and a plurality of UEs.
  • the network and the UEs are simply utilized for illustrating the structure of the wireless communications system 1200.
  • the network terminal may comprise a plurality of base stations (or Node B), radio network controllers and so on according to actual demands, and the UEs can be devices such as mobile phones, computer systems, etc.
  • Fig. 1 is a functional block diagram of a communications device 100.
  • the communications device 100 can be used for implementing the network and the UE shown in Fig. 12.
  • Fig. 1 only shows an input device 102, an output device 104, a control circuit 106, a central processing unit (CPU) 108, a memory 110, a program code 112, and a transceiver 114 of the communications device 100.
  • the control circuit 106 executes the program code 112 in the memory 110 through the CPU 108, thereby controlling an operation of the communications device 100.
  • the communications device 100 can receive signals input by a user through the input device 102, such as a keyboard, and can output images and sounds through the output device 104, such as a monitor or speakers.
  • the transceiver 114 is used to receive and transmit wireless signals, delivering received signals to the control circuit 106, and outputting signals generated by the control circuit 106 wirelessly. From a perspective of a communications protocol framework, the transceiver 114 can be seen as a portion of Layer 1, and the control circuit 106 can be utilized to realize functions of Layer 2 and Layer 3.
  • the communications device 100 is utilized in a third generation (3G) mobile communications system.
  • 3G third generation
  • Fig. 2 is a diagram of the program code 112 shown in Fig. 1 .
  • the program code 112 includes a Non Access Stratum (NAS) 200, a Layer 3 202, and a Layer 2 206, and is coupled to a Layer 1 218.
  • the NAS 200 can generate NAS messages for realizing NAS applications.
  • the Layer 3 202 is composed of an RRC layer, for performing radio resource control.
  • the Layer 2 206 performs link control, and the Layer 1 218 performs physical connections. Whether a PDCP layer belongs to the Layer 3 202 or the Layer 2 206 is not relevant to this invention.
  • a RACH is configured in the communications device 100 for the random access procedure.
  • the embodiment of the present invention provides a RA processing program code 220 for handling a random access procedure, so as to prevent the prior art problems.
  • definitions of the messages 1, 2, 3, 4 are the same as what mentioned above. That is, the message I is corresponding to step "Random Access Preamble on RACH in uplink”, the message 2 is corresponding to step “Random Access Response on DL-SCH”, the message 3 is corresponding to step "First scheduled UL transmission on UL-SCH”, and the message 4 is corresponding to step "Contention Resolution on DL-SCH.”
  • Fig. 3 illustrates a process 40 according to an embodiment of the present invention.
  • the process 40 is utilized for handling a random access procedure in a network of the wireless communications system 1200, and can be compiled into the RA processing program code 220.
  • the process 40 comprises the following steps: Step 400: Start.
  • Step 402 During the random access procedure, send a message 4 conveying a UE identity received in a message 3 for contention resolution.
  • a message 4 sent from the network conveys a UE identity received in a message 3 for contention resolution during the random access procedure.
  • the network can use a C-RNTI of the UE or a T-CRNTI corresponding to the UE, to address the message 4 to the UE.
  • the UE shall adopt the T-CRNTI as the C-RNTI.
  • the UE keeps using the C-RNTI.
  • the network can detect the C-RNTI according to the UE identity in the message 3, and release the T-CRNTI and allowing assigning the T-CRNTI to other random UEs when the C-RNTI is detected.
  • the C-RNTI held by the UE may either have been released or become invalid before message 4 (e.g. message 4 is asynchronous to message 3 and three retransmissions are allowed) addressed by UE identity (e.g. can be invalid as well) is received by the UE. Consequently, for example, network may consider that the UE uses its original C-RNTI so as to relocate T-CRNTI assigned in message 2 to other random access UEs while the UE adopts the previous received T-CRNTI as its C-RNTI.
  • the network can detect the C-RNTI according to the UE identity in the message 3, and release the T-CRNTI and allowing assigning the T-CRNTI to other random UEs when the C-RNTI is detected.
  • the embodiment of the present invention provides different operations of the random access procedure, to achieve timing alignment and resource request.
EP08005480A 2007-03-21 2008-03-25 Method and apparatus for handling random access procedure in a wireless communications system Active EP1973365B1 (en)

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US89598707P 2007-03-21 2007-03-21
US94594807P 2007-06-25 2007-06-25
US98321807P 2007-10-28 2007-10-28

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EP1973365A2 EP1973365A2 (en) 2008-09-24
EP1973365A3 EP1973365A3 (en) 2008-12-31
EP1973365B1 true EP1973365B1 (en) 2011-12-21

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US (1) US9668279B2 (ja)
EP (1) EP1973365B1 (ja)
JP (2) JP2008278473A (ja)
KR (2) KR20080086416A (ja)
AT (1) ATE538620T1 (ja)
ES (1) ES2378584T3 (ja)
TW (1) TWI364936B (ja)

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TWI364936B (en) 2012-05-21
EP1973365A3 (en) 2008-12-31
KR20100076919A (ko) 2010-07-06
ATE538620T1 (de) 2012-01-15
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